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Allowance for Loan Losses - Allowance and Recorded Investments in Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | $ 358,325 | $ 272,123 | $ 341,121 | $ 251,475
Total provision | 92,915 | 62,894 | 158,575 | 118,443
Net charge-offs: |  |  |  |
Charge-offs | (74,627) | (45,434) | (129,689) | (84,237)
Recoveries | 7,384 | 5,694 | 13,990 | 10,812
Net charge-offs | (67,243) | (39,740) | (115,699) | (73,425)
Loan sales |  |  |  | (1,216)
Allowance at end of period | 383,997 | 295,277 | 383,997 | 295,277
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 146,403 | 113,343 | 146,403 | 113,343
Ending balance: collectively evaluated for impairment | 237,594 | 181,934 | 237,594 | 181,934
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 1,411,189 | 1,121,816 | 1,411,189 | 1,121,816
Ending balance: collectively evaluated for impairment | 22,164,795 | 19,417,648 | 22,164,795 | 19,417,648
FFELP Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | 1,760 | 1,113 | 977 | 1,132
Total provision | 145 | 252 | 1,162 | 483
Net charge-offs: |  |  |  |
Charge-offs | (171) | (292) | (405) | (542)
Recoveries | 0 | 0 | 0 | 0
Net charge-offs | (171) | (292) | (405) | (542)
Loan sales |  |  |  | 0
Allowance at end of period | 1,734 | 1,073 | 1,734 | 1,073
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 1,734 | 1,073 | 1,734 | 1,073
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | $ 812,500 | $ 885,357 | $ 812,500 | $ 885,357
Net charge-offs as a percentage of average loans in repayment (annualized) | 0.11% | 0.17% | 0.13% | 0.15%
Allowance as a percentage of the ending total loan balance | 0.21% | 0.12% | 0.21% | 0.12%
Allowance as a percentage of the ending loans in repayment | 0.28% | 0.16% | 0.28% | 0.16%
Allowance coverage of net charge-offs (annualized) | 2.54 | 0.92 | 2.14 | 0.99
Ending total loans, gross | $ 812,500 | $ 885,357 | $ 812,500 | $ 885,357
Average loans in repayment | 634,932 | 698,197 | 642,693 | 709,010
Ending loans in repayment | 620,292 | 680,802 | 620,292 | 680,802
Private Education Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | 285,946 | 252,103 | 277,943 | 243,715
Total provision | 71,296 | 46,264 | 113,179 | 88,134
Net charge-offs: |  |  |  |
Charge-offs | (55,382) | (42,270) | (94,959) | (79,623)
Recoveries | 6,108 | 5,598 | 11,805 | 10,685
Net charge-offs | (49,274) | (36,672) | (83,154) | (68,938)
Loan sales |  |  |  | (1,216)
Allowance at end of period | 307,968 | 261,695 | 307,968 | 261,695
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 146,403 | 113,343 | 146,403 | 113,343
Ending balance: collectively evaluated for impairment | 161,565 | 148,352 | 161,565 | 148,352
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 1,411,189 | 1,121,816 | 1,411,189 | 1,121,816
Ending balance: collectively evaluated for impairment | $ 20,217,658 | $ 17,566,211 | $ 20,217,658 | $ 17,566,211
Net charge-offs as a percentage of average loans in repayment (annualized) | 1.29% | 1.14% | 1.09% | 1.08%
Allowance as a percentage of the ending total loan balance | 1.42% | 1.40% | 1.42% | 1.40%
Allowance as a percentage of the ending loans in repayment | 2.01% | 2.02% | 2.01% | 2.02%
Allowance coverage of net charge-offs (annualized) | 1.56 | 1.78 | 1.85 | 1.90
Ending total loans, gross | $ 21,628,847 | $ 18,688,027 | $ 21,628,847 | $ 18,688,027
Average loans in repayment | 15,241,574 | 12,909,623 | 15,188,003 | 12,810,072
Ending loans in repayment | 15,332,251 | 12,979,523 | 15,332,251 | 12,979,523
Personal Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | 70,619 | 18,907 | 62,201 | 6,628
Total provision | 21,474 | 16,378 | 44,234 | 29,826
Net charge-offs: |  |  |  |
Charge-offs | (19,074) | (2,872) | (34,325) | (4,072)
Recoveries | 1,276 | 96 | 2,185 | 127
Net charge-offs | (17,798) | (2,776) | (32,140) | (3,945)
Loan sales |  |  |  | 0
Allowance at end of period | 74,295 | 32,509 | 74,295 | 32,509
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 74,295 | 32,509 | 74,295 | 32,509
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | $ 1,134,637 | $ 966,080 | $ 1,134,637 | $ 966,080
Net charge-offs as a percentage of average loans in repayment (annualized) | 6.20% | 1.36% | 5.53% | 1.17%
Allowance as a percentage of the ending total loan balance | 6.55% | 3.37% | 6.55% | 3.37%
Allowance as a percentage of the ending loans in repayment | 6.55% | 3.37% | 6.55% | 3.37%
Allowance coverage of net charge-offs (annualized) | 1.04 | 2.93 | 1.16 | 4.12
Ending total loans, gross | $ 1,134,637 | $ 966,080 | $ 1,134,637 | $ 966,080
Average loans in repayment | 1,148,444 | 815,741 | 1,161,761 | 673,552
Ending loans in repayment | $ 1,134,637 | $ 966,080 | $ 1,134,637 | $ 966,080

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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